After graphing all equipotentials, sketch in the electric field lines. Repeat this step until you have mapped equipotential surfaces for every grid mark on the line between pins A and B. Now move point Cone grid-mark to the right of its initial point on the line between pins A and B and repeat steps 3 through five. Measure the potential difference of this equipotential surface relative to pin B and write the value on the white grid paper next to the equipotential surface. Connect the marks you have made on the white grid paper with a smooth line this is the graph of your first equipotential surface. Do this as many times as necessary until you have worked your way completely around pin B. Repeat step 3 choosing a slightly different starting point for the V probe near pin B. (You'll know you've gone through 0.00 V if the voltmeter reading changes from negative to positive or vice versa.) The V probe is now on the same equipotential surface as the COM probe at point C: mark the position of the probe on the white grid paper. Holding the COM probe in place and maintaining contact between the V probe and the conductive paper, pull the probe radially away from pin B until the voltmeter display shows 0.00 V. The voltmeter will display a non-zero value this is the electric potential at the V probe relative to point C. Place the V probe on the conductive paper very near (but not touching) pin B. Do not push the COM probe through the paper into the corkboard. (You won't get shocked it might alter the electric field you are trying to measure.) Touch the COM probe to the conductive paper at point C, one grid-mark to the right of pin B and on the line between pins A and B. While carrying out the following instructions, do your best not to touch the conductive paper. The field has also created equipotential surfaces (i.e., a collection of points all at the same potential): these are the equipotential surfaces you will identify with the voltmeter. Additionally, there are now differences in electric potential from point to point on the conductive paper due to the presence of the dipole electric field. Pins A and B now simulate equal positive and negative charges an electric dipole and they create an electric field throughout the conductive paper, this is the dipole electric field you will map. Turn on the power source and adjust its terminal voltage to 10.0 V (don't go by the power-source display: instead measure the voltage with the voltmeter). Mark the positions of pins A and B on the white grid paper. Connect circuit wires from pin A to the positive terminal of the power source and from pin B to the negative terminal. Push the pins firmly into the corkboard to ensure good contact with the conductive paper. Push metal pins A and B into the conductive paper five grid-marks to either side of the paper's centerline. equipotential surface 10.00 V com V oooo B Part 1: Mapping the Electric Field of a Dipoleġ) 2. Secure the gray, conductive paper in place with plastic pushpins at each corner. Part 1: Mapping the Electric Field of a Dipole Figure I shows the apparatus for mapping the field of an electric dipole charge distribution (charges A and B).
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